Page 467 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Properties of Hydrocarbon Mixtures 423

Flgure 6-31. P, vs. V, plot for Peng-Robinson equation [17].

it [18]. For purposes of the procedure for locating the boundaries of the liquid
and vapor phase compressibility factors in the two-phase region discussion,
assume that the equation of state is given in the form

Z9 + aZs + pz + y = 0 (6-56)
where y, p are arbitrary constants.
From Figure 6-33a-d in the two phase region the equation of state will have
a maximum and a minimum or two points at which the slope of the equation